mirror of
https://github.com/samba-team/samba.git
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3b666bf0f9
Thanks to Günther Deschner! Volker
984 lines
24 KiB
C
984 lines
24 KiB
C
/*
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Unix SMB/CIFS implementation.
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Copyright (C) Andrew Tridgell 2006
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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this is the change notify database. It implements mechanisms for
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storing current change notify waiters in a tdb, and checking if a
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given event matches any of the stored notify waiiters.
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*/
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#include "includes.h"
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#include "librpc/gen_ndr/ndr_notify.h"
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struct notify_context {
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struct db_context *db_recursive;
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struct db_context *db_onelevel;
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struct server_id server;
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struct messaging_context *messaging_ctx;
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struct notify_list *list;
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struct notify_array *array;
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int seqnum;
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struct sys_notify_context *sys_notify_ctx;
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TDB_DATA key;
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};
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struct notify_list {
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struct notify_list *next, *prev;
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void *private_data;
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void (*callback)(void *, const struct notify_event *);
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void *sys_notify_handle;
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int depth;
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};
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#define NOTIFY_KEY "notify array"
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#define NOTIFY_ENABLE "notify:enable"
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#define NOTIFY_ENABLE_DEFAULT True
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static NTSTATUS notify_remove_all(struct notify_context *notify,
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const struct server_id *server);
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static void notify_handler(struct messaging_context *msg_ctx, void *private_data,
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uint32_t msg_type, struct server_id server_id, DATA_BLOB *data);
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/*
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destroy the notify context
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*/
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static int notify_destructor(struct notify_context *notify)
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{
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messaging_deregister(notify->messaging_ctx, MSG_PVFS_NOTIFY, notify);
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if (notify->list != NULL) {
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notify_remove_all(notify, ¬ify->server);
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}
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return 0;
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}
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/*
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Open up the notify.tdb database. You should close it down using
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talloc_free(). We need the messaging_ctx to allow for notifications
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via internal messages
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*/
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struct notify_context *notify_init(TALLOC_CTX *mem_ctx, struct server_id server,
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struct messaging_context *messaging_ctx,
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struct event_context *ev,
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connection_struct *conn)
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{
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struct notify_context *notify;
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if (!lp_change_notify(conn->params)) {
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return NULL;
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}
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notify = talloc(mem_ctx, struct notify_context);
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if (notify == NULL) {
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return NULL;
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}
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notify->db_recursive = db_open(notify, lock_path("notify.tdb"),
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0, TDB_SEQNUM|TDB_CLEAR_IF_FIRST,
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O_RDWR|O_CREAT, 0644);
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if (notify->db_recursive == NULL) {
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talloc_free(notify);
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return NULL;
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}
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notify->db_onelevel = db_open(notify, lock_path("notify_onelevel.tdb"),
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0, TDB_SEQNUM|TDB_CLEAR_IF_FIRST,
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O_RDWR|O_CREAT, 0644);
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if (notify->db_onelevel == NULL) {
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talloc_free(notify);
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return NULL;
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}
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notify->server = server;
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notify->messaging_ctx = messaging_ctx;
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notify->list = NULL;
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notify->array = NULL;
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notify->seqnum = notify->db_recursive->get_seqnum(
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notify->db_recursive);
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notify->key = string_term_tdb_data(NOTIFY_KEY);
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talloc_set_destructor(notify, notify_destructor);
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/* register with the messaging subsystem for the notify
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message type */
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messaging_register(notify->messaging_ctx, notify,
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MSG_PVFS_NOTIFY, notify_handler);
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notify->sys_notify_ctx = sys_notify_context_create(conn, notify, ev);
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return notify;
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}
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/*
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lock and fetch the record
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*/
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static NTSTATUS notify_fetch_locked(struct notify_context *notify, struct db_record **rec)
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{
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*rec = notify->db_recursive->fetch_locked(notify->db_recursive,
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notify, notify->key);
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if (*rec == NULL) {
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return NT_STATUS_INTERNAL_DB_CORRUPTION;
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}
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return NT_STATUS_OK;
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}
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/*
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load the notify array
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*/
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static NTSTATUS notify_load(struct notify_context *notify, struct db_record *rec)
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{
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TDB_DATA dbuf;
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DATA_BLOB blob;
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NTSTATUS status;
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int seqnum;
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seqnum = notify->db_recursive->get_seqnum(notify->db_recursive);
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if (seqnum == notify->seqnum && notify->array != NULL) {
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return NT_STATUS_OK;
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}
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notify->seqnum = seqnum;
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talloc_free(notify->array);
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notify->array = TALLOC_ZERO_P(notify, struct notify_array);
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NT_STATUS_HAVE_NO_MEMORY(notify->array);
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if (!rec) {
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if (notify->db_recursive->fetch(notify->db_recursive, notify,
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notify->key, &dbuf) != 0) {
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return NT_STATUS_INTERNAL_DB_CORRUPTION;
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}
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} else {
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dbuf = rec->value;
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}
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blob.data = (uint8 *)dbuf.dptr;
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blob.length = dbuf.dsize;
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status = NT_STATUS_OK;
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if (blob.length > 0) {
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enum ndr_err_code ndr_err;
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ndr_err = ndr_pull_struct_blob(&blob, notify->array, NULL, notify->array,
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(ndr_pull_flags_fn_t)ndr_pull_notify_array);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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}
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}
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if (DEBUGLEVEL >= 10) {
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DEBUG(10, ("notify_load:\n"));
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NDR_PRINT_DEBUG(notify_array, notify->array);
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}
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if (!rec) {
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talloc_free(dbuf.dptr);
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}
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return status;
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}
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/*
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compare notify entries for sorting
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*/
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static int notify_compare(const void *p1, const void *p2)
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{
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const struct notify_entry *e1 = (const struct notify_entry *)p1;
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const struct notify_entry *e2 = (const struct notify_entry *)p2;
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return strcmp(e1->path, e2->path);
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}
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/*
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save the notify array
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*/
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static NTSTATUS notify_save(struct notify_context *notify, struct db_record *rec)
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{
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TDB_DATA dbuf;
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DATA_BLOB blob;
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NTSTATUS status;
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enum ndr_err_code ndr_err;
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TALLOC_CTX *tmp_ctx;
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/* if possible, remove some depth arrays */
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while (notify->array->num_depths > 0 &&
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notify->array->depth[notify->array->num_depths-1].num_entries == 0) {
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notify->array->num_depths--;
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}
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/* we might just be able to delete the record */
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if (notify->array->num_depths == 0) {
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return rec->delete_rec(rec);
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}
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tmp_ctx = talloc_new(notify);
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NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
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ndr_err = ndr_push_struct_blob(&blob, tmp_ctx, NULL, notify->array,
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(ndr_push_flags_fn_t)ndr_push_notify_array);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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talloc_free(tmp_ctx);
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return ndr_map_error2ntstatus(ndr_err);
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}
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if (DEBUGLEVEL >= 10) {
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DEBUG(10, ("notify_save:\n"));
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NDR_PRINT_DEBUG(notify_array, notify->array);
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}
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dbuf.dptr = blob.data;
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dbuf.dsize = blob.length;
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status = rec->store(rec, dbuf, TDB_REPLACE);
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talloc_free(tmp_ctx);
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return status;
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}
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/*
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handle incoming notify messages
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*/
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static void notify_handler(struct messaging_context *msg_ctx, void *private_data,
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uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
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{
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struct notify_context *notify = talloc_get_type(private_data, struct notify_context);
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enum ndr_err_code ndr_err;
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struct notify_event ev;
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TALLOC_CTX *tmp_ctx = talloc_new(notify);
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struct notify_list *listel;
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if (tmp_ctx == NULL) {
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return;
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}
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ndr_err = ndr_pull_struct_blob(data, tmp_ctx, NULL, &ev,
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(ndr_pull_flags_fn_t)ndr_pull_notify_event);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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talloc_free(tmp_ctx);
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return;
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}
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for (listel=notify->list;listel;listel=listel->next) {
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if (listel->private_data == ev.private_data) {
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listel->callback(listel->private_data, &ev);
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break;
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}
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}
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talloc_free(tmp_ctx);
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}
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/*
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callback from sys_notify telling us about changes from the OS
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*/
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static void sys_notify_callback(struct sys_notify_context *ctx,
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void *ptr, struct notify_event *ev)
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{
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struct notify_list *listel = talloc_get_type(ptr, struct notify_list);
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ev->private_data = listel;
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DEBUG(10, ("sys_notify_callback called with action=%d, for %s\n",
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ev->action, ev->path));
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listel->callback(listel->private_data, ev);
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}
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/*
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add an entry to the notify array
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*/
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static NTSTATUS notify_add_array(struct notify_context *notify, struct db_record *rec,
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struct notify_entry *e,
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void *private_data, int depth)
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{
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int i;
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struct notify_depth *d;
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struct notify_entry *ee;
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/* possibly expand the depths array */
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if (depth >= notify->array->num_depths) {
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d = talloc_realloc(notify->array, notify->array->depth,
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struct notify_depth, depth+1);
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NT_STATUS_HAVE_NO_MEMORY(d);
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for (i=notify->array->num_depths;i<=depth;i++) {
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ZERO_STRUCT(d[i]);
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}
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notify->array->depth = d;
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notify->array->num_depths = depth+1;
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}
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d = ¬ify->array->depth[depth];
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/* expand the entries array */
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ee = talloc_realloc(notify->array->depth, d->entries, struct notify_entry,
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d->num_entries+1);
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NT_STATUS_HAVE_NO_MEMORY(ee);
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d->entries = ee;
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d->entries[d->num_entries] = *e;
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d->entries[d->num_entries].private_data = private_data;
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d->entries[d->num_entries].server = notify->server;
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d->entries[d->num_entries].path_len = strlen(e->path);
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d->num_entries++;
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d->max_mask |= e->filter;
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d->max_mask_subdir |= e->subdir_filter;
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if (d->num_entries > 1) {
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qsort(d->entries, d->num_entries, sizeof(d->entries[0]), notify_compare);
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}
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/* recalculate the maximum masks */
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d->max_mask = 0;
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d->max_mask_subdir = 0;
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for (i=0;i<d->num_entries;i++) {
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d->max_mask |= d->entries[i].filter;
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d->max_mask_subdir |= d->entries[i].subdir_filter;
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}
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return notify_save(notify, rec);
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}
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/*
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Add a non-recursive watch
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*/
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static void notify_add_onelevel(struct notify_context *notify,
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struct notify_entry *e, void *private_data)
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{
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struct notify_entry_array *array;
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struct db_record *rec;
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DATA_BLOB blob;
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TDB_DATA dbuf;
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enum ndr_err_code ndr_err;
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NTSTATUS status;
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array = talloc_zero(talloc_tos(), struct notify_entry_array);
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if (array == NULL) {
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return;
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}
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rec = notify->db_onelevel->fetch_locked(
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notify->db_onelevel, talloc_tos(),
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make_tdb_data((uint8_t *)&e->dir_id, sizeof(e->dir_id)));
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if (rec == NULL) {
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DEBUG(10, ("notify_add_onelevel: fetch_locked for %s failed"
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"\n", file_id_string_tos(&e->dir_id)));
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TALLOC_FREE(array);
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return;
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}
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blob.data = (uint8_t *)rec->value.dptr;
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blob.length = rec->value.dsize;
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if (blob.length > 0) {
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ndr_err = ndr_pull_struct_blob(
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&blob, array, NULL, array,
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(ndr_pull_flags_fn_t)ndr_pull_notify_entry_array);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(10, ("ndr_pull_notify_entry_array failed: %s\n",
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ndr_errstr(ndr_err)));
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TALLOC_FREE(array);
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return;
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}
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if (DEBUGLEVEL >= 10) {
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DEBUG(10, ("notify_add_onelevel:\n"));
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NDR_PRINT_DEBUG(notify_entry_array, array);
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}
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}
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array->entries = talloc_realloc(array, array->entries,
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struct notify_entry,
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array->num_entries+1);
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if (array->entries == NULL) {
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TALLOC_FREE(array);
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return;
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}
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array->entries[array->num_entries] = *e;
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array->entries[array->num_entries].private_data = private_data;
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array->entries[array->num_entries].server = notify->server;
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array->num_entries += 1;
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ndr_err = ndr_push_struct_blob(
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&blob, rec, NULL, array,
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(ndr_push_flags_fn_t)ndr_push_notify_entry_array);
|
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(10, ("ndr_push_notify_entry_array failed: %s\n",
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ndr_errstr(ndr_err)));
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TALLOC_FREE(array);
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return;
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}
|
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|
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if (DEBUGLEVEL >= 10) {
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DEBUG(10, ("notify_add_onelevel:\n"));
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NDR_PRINT_DEBUG(notify_entry_array, array);
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}
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|
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dbuf.dptr = blob.data;
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dbuf.dsize = blob.length;
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|
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status = rec->store(rec, dbuf, TDB_REPLACE);
|
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TALLOC_FREE(array);
|
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if (!NT_STATUS_IS_OK(status)) {
|
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DEBUG(10, ("notify_add_onelevel: store failed: %s\n",
|
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nt_errstr(status)));
|
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return;
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}
|
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e->filter = 0;
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return;
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}
|
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|
|
|
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/*
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add a notify watch. This is called when a notify is first setup on a open
|
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directory handle.
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*/
|
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NTSTATUS notify_add(struct notify_context *notify, struct notify_entry *e0,
|
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void (*callback)(void *, const struct notify_event *),
|
|
void *private_data)
|
|
{
|
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struct notify_entry e = *e0;
|
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NTSTATUS status;
|
|
char *tmp_path = NULL;
|
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struct notify_list *listel;
|
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size_t len;
|
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int depth;
|
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struct db_record *rec;
|
|
|
|
/* see if change notify is enabled at all */
|
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if (notify == NULL) {
|
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return NT_STATUS_NOT_IMPLEMENTED;
|
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}
|
|
|
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status = notify_fetch_locked(notify, &rec);
|
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NT_STATUS_NOT_OK_RETURN(status);
|
|
|
|
status = notify_load(notify, rec);
|
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if (!NT_STATUS_IS_OK(status)) {
|
|
talloc_free(rec);
|
|
return status;
|
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}
|
|
|
|
/* cope with /. on the end of the path */
|
|
len = strlen(e.path);
|
|
if (len > 1 && e.path[len-1] == '.' && e.path[len-2] == '/') {
|
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tmp_path = talloc_strndup(notify, e.path, len-2);
|
|
if (tmp_path == NULL) {
|
|
status = NT_STATUS_NO_MEMORY;
|
|
goto done;
|
|
}
|
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e.path = tmp_path;
|
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}
|
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|
|
depth = count_chars(e.path, '/');
|
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|
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listel = TALLOC_ZERO_P(notify, struct notify_list);
|
|
if (listel == NULL) {
|
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status = NT_STATUS_NO_MEMORY;
|
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goto done;
|
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}
|
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|
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listel->private_data = private_data;
|
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listel->callback = callback;
|
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listel->depth = depth;
|
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DLIST_ADD(notify->list, listel);
|
|
|
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/* ignore failures from sys_notify */
|
|
if (notify->sys_notify_ctx != NULL) {
|
|
/*
|
|
this call will modify e.filter and e.subdir_filter
|
|
to remove bits handled by the backend
|
|
*/
|
|
status = sys_notify_watch(notify->sys_notify_ctx, &e,
|
|
sys_notify_callback, listel,
|
|
&listel->sys_notify_handle);
|
|
if (NT_STATUS_IS_OK(status)) {
|
|
talloc_steal(listel, listel->sys_notify_handle);
|
|
}
|
|
}
|
|
|
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if (e.filter != 0) {
|
|
notify_add_onelevel(notify, &e, private_data);
|
|
status = NT_STATUS_OK;
|
|
}
|
|
|
|
/* if the system notify handler couldn't handle some of the
|
|
filter bits, or couldn't handle a request for recursion
|
|
then we need to install it in the array used for the
|
|
intra-samba notify handling */
|
|
if (e.filter != 0 || e.subdir_filter != 0) {
|
|
status = notify_add_array(notify, rec, &e, private_data, depth);
|
|
}
|
|
|
|
done:
|
|
talloc_free(rec);
|
|
talloc_free(tmp_path);
|
|
|
|
return status;
|
|
}
|
|
|
|
NTSTATUS notify_remove_onelevel(struct notify_context *notify,
|
|
const struct file_id *fid,
|
|
void *private_data)
|
|
{
|
|
struct notify_entry_array *array;
|
|
struct db_record *rec;
|
|
DATA_BLOB blob;
|
|
TDB_DATA dbuf;
|
|
enum ndr_err_code ndr_err;
|
|
NTSTATUS status;
|
|
int i;
|
|
|
|
array = talloc_zero(talloc_tos(), struct notify_entry_array);
|
|
if (array == NULL) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
rec = notify->db_onelevel->fetch_locked(
|
|
notify->db_onelevel, talloc_tos(),
|
|
make_tdb_data((uint8_t *)fid, sizeof(*fid)));
|
|
if (rec == NULL) {
|
|
DEBUG(10, ("notify_remove_onelevel: fetch_locked for %s failed"
|
|
"\n", file_id_string_tos(fid)));
|
|
TALLOC_FREE(array);
|
|
return NT_STATUS_INTERNAL_DB_CORRUPTION;
|
|
}
|
|
|
|
blob.data = (uint8_t *)rec->value.dptr;
|
|
blob.length = rec->value.dsize;
|
|
|
|
if (blob.length > 0) {
|
|
ndr_err = ndr_pull_struct_blob(
|
|
&blob, array, NULL, array,
|
|
(ndr_pull_flags_fn_t)ndr_pull_notify_entry_array);
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
DEBUG(10, ("ndr_pull_notify_entry_array failed: %s\n",
|
|
ndr_errstr(ndr_err)));
|
|
TALLOC_FREE(array);
|
|
return ndr_map_error2ntstatus(ndr_err);
|
|
}
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10, ("notify_remove_onelevel:\n"));
|
|
NDR_PRINT_DEBUG(notify_entry_array, array);
|
|
}
|
|
}
|
|
|
|
for (i=0; i<array->num_entries; i++) {
|
|
if ((private_data == array->entries[i].private_data) &&
|
|
cluster_id_equal(¬ify->server,
|
|
&array->entries[i].server)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == array->num_entries) {
|
|
TALLOC_FREE(array);
|
|
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
|
|
array->entries[i] = array->entries[array->num_entries-1];
|
|
array->num_entries -= 1;
|
|
|
|
if (array->num_entries == 0) {
|
|
rec->delete_rec(rec);
|
|
TALLOC_FREE(array);
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
ndr_err = ndr_push_struct_blob(
|
|
&blob, rec, NULL, array,
|
|
(ndr_push_flags_fn_t)ndr_push_notify_entry_array);
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
DEBUG(10, ("ndr_push_notify_entry_array failed: %s\n",
|
|
ndr_errstr(ndr_err)));
|
|
TALLOC_FREE(array);
|
|
return ndr_map_error2ntstatus(ndr_err);
|
|
}
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10, ("notify_add_onelevel:\n"));
|
|
NDR_PRINT_DEBUG(notify_entry_array, array);
|
|
}
|
|
|
|
dbuf.dptr = blob.data;
|
|
dbuf.dsize = blob.length;
|
|
|
|
status = rec->store(rec, dbuf, TDB_REPLACE);
|
|
TALLOC_FREE(array);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(10, ("notify_add_onelevel: store failed: %s\n",
|
|
nt_errstr(status)));
|
|
return status;
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*
|
|
remove a notify watch. Called when the directory handle is closed
|
|
*/
|
|
NTSTATUS notify_remove(struct notify_context *notify, void *private_data)
|
|
{
|
|
NTSTATUS status;
|
|
struct notify_list *listel;
|
|
int i, depth;
|
|
struct notify_depth *d;
|
|
struct db_record *rec;
|
|
|
|
/* see if change notify is enabled at all */
|
|
if (notify == NULL) {
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
for (listel=notify->list;listel;listel=listel->next) {
|
|
if (listel->private_data == private_data) {
|
|
DLIST_REMOVE(notify->list, listel);
|
|
break;
|
|
}
|
|
}
|
|
if (listel == NULL) {
|
|
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
|
|
depth = listel->depth;
|
|
|
|
talloc_free(listel);
|
|
|
|
status = notify_fetch_locked(notify, &rec);
|
|
NT_STATUS_NOT_OK_RETURN(status);
|
|
|
|
status = notify_load(notify, rec);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
talloc_free(rec);
|
|
return status;
|
|
}
|
|
|
|
if (depth >= notify->array->num_depths) {
|
|
talloc_free(rec);
|
|
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
|
|
/* we only have to search at the depth of this element */
|
|
d = ¬ify->array->depth[depth];
|
|
|
|
for (i=0;i<d->num_entries;i++) {
|
|
if (private_data == d->entries[i].private_data &&
|
|
cluster_id_equal(¬ify->server, &d->entries[i].server)) {
|
|
break;
|
|
}
|
|
}
|
|
if (i == d->num_entries) {
|
|
talloc_free(rec);
|
|
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
|
|
if (i < d->num_entries-1) {
|
|
memmove(&d->entries[i], &d->entries[i+1],
|
|
sizeof(d->entries[i])*(d->num_entries-(i+1)));
|
|
}
|
|
d->num_entries--;
|
|
|
|
status = notify_save(notify, rec);
|
|
|
|
talloc_free(rec);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
remove all notify watches for a messaging server
|
|
*/
|
|
static NTSTATUS notify_remove_all(struct notify_context *notify,
|
|
const struct server_id *server)
|
|
{
|
|
NTSTATUS status;
|
|
int i, depth, del_count=0;
|
|
struct db_record *rec;
|
|
|
|
status = notify_fetch_locked(notify, &rec);
|
|
NT_STATUS_NOT_OK_RETURN(status);
|
|
|
|
status = notify_load(notify, rec);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
talloc_free(rec);
|
|
return status;
|
|
}
|
|
|
|
/* we have to search for all entries across all depths, looking for matches
|
|
for the server id */
|
|
for (depth=0;depth<notify->array->num_depths;depth++) {
|
|
struct notify_depth *d = ¬ify->array->depth[depth];
|
|
for (i=0;i<d->num_entries;i++) {
|
|
if (cluster_id_equal(server, &d->entries[i].server)) {
|
|
if (i < d->num_entries-1) {
|
|
memmove(&d->entries[i], &d->entries[i+1],
|
|
sizeof(d->entries[i])*(d->num_entries-(i+1)));
|
|
}
|
|
i--;
|
|
d->num_entries--;
|
|
del_count++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (del_count > 0) {
|
|
status = notify_save(notify, rec);
|
|
}
|
|
|
|
talloc_free(rec);
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
/*
|
|
send a notify message to another messaging server
|
|
*/
|
|
static NTSTATUS notify_send(struct notify_context *notify, struct notify_entry *e,
|
|
const char *path, uint32_t action)
|
|
{
|
|
struct notify_event ev;
|
|
DATA_BLOB data;
|
|
NTSTATUS status;
|
|
enum ndr_err_code ndr_err;
|
|
TALLOC_CTX *tmp_ctx;
|
|
|
|
ev.action = action;
|
|
ev.path = path;
|
|
ev.private_data = e->private_data;
|
|
|
|
tmp_ctx = talloc_new(notify);
|
|
|
|
ndr_err = ndr_push_struct_blob(&data, tmp_ctx, NULL, &ev,
|
|
(ndr_push_flags_fn_t)ndr_push_notify_event);
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
talloc_free(tmp_ctx);
|
|
return ndr_map_error2ntstatus(ndr_err);
|
|
}
|
|
|
|
status = messaging_send(notify->messaging_ctx, e->server,
|
|
MSG_PVFS_NOTIFY, &data);
|
|
talloc_free(tmp_ctx);
|
|
return status;
|
|
}
|
|
|
|
void notify_onelevel(struct notify_context *notify, uint32_t action,
|
|
uint32_t filter, struct file_id fid, const char *name)
|
|
{
|
|
struct notify_entry_array *array;
|
|
TDB_DATA dbuf;
|
|
DATA_BLOB blob;
|
|
bool have_dead_entries = false;
|
|
int i;
|
|
|
|
if (notify == NULL) {
|
|
return;
|
|
}
|
|
|
|
array = talloc_zero(talloc_tos(), struct notify_entry_array);
|
|
if (array == NULL) {
|
|
return;
|
|
}
|
|
|
|
if (notify->db_onelevel->fetch(
|
|
notify->db_onelevel, array,
|
|
make_tdb_data((uint8_t *)&fid, sizeof(fid)),
|
|
&dbuf) == -1) {
|
|
TALLOC_FREE(array);
|
|
return;
|
|
}
|
|
|
|
blob.data = (uint8 *)dbuf.dptr;
|
|
blob.length = dbuf.dsize;
|
|
|
|
if (blob.length > 0) {
|
|
enum ndr_err_code ndr_err;
|
|
ndr_err = ndr_pull_struct_blob(
|
|
&blob, array, NULL, array,
|
|
(ndr_pull_flags_fn_t)ndr_pull_notify_entry_array);
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
DEBUG(10, ("ndr_pull_notify_entry_array failed: %s\n",
|
|
ndr_errstr(ndr_err)));
|
|
TALLOC_FREE(array);
|
|
return;
|
|
}
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10, ("notify_onelevel:\n"));
|
|
NDR_PRINT_DEBUG(notify_entry_array, array);
|
|
}
|
|
}
|
|
|
|
for (i=0; i<array->num_entries; i++) {
|
|
struct notify_entry *e = &array->entries[i];
|
|
|
|
if ((e->filter & filter) != 0) {
|
|
NTSTATUS status;
|
|
|
|
status = notify_send(notify, e, name, action);
|
|
if (NT_STATUS_EQUAL(
|
|
status, NT_STATUS_INVALID_HANDLE)) {
|
|
/*
|
|
* Mark the entry as dead. All entries have a
|
|
* path set. The marker used here is setting
|
|
* that to NULL.
|
|
*/
|
|
e->path = NULL;
|
|
have_dead_entries = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!have_dead_entries) {
|
|
TALLOC_FREE(array);
|
|
return;
|
|
}
|
|
|
|
for (i=0; i<array->num_entries; i++) {
|
|
struct notify_entry *e = &array->entries[i];
|
|
if (e->path != NULL) {
|
|
continue;
|
|
}
|
|
DEBUG(10, ("Deleting notify entries for process %s because "
|
|
"it's gone\n", procid_str_static(&e->server)));
|
|
/*
|
|
* Potential TODO: This might need optimizing,
|
|
* notify_remove_onelevel() does a fetch_locked() operation at
|
|
* every call. But this would only matter if a process with
|
|
* MANY notifies has died without shutting down properly.
|
|
*/
|
|
notify_remove_onelevel(notify, &e->dir_id, e->private_data);
|
|
}
|
|
|
|
TALLOC_FREE(array);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
trigger a notify message for anyone waiting on a matching event
|
|
|
|
This function is called a lot, and needs to be very fast. The unusual data structure
|
|
and traversal is designed to be fast in the average case, even for large numbers of
|
|
notifies
|
|
*/
|
|
void notify_trigger(struct notify_context *notify,
|
|
uint32_t action, uint32_t filter, const char *path)
|
|
{
|
|
NTSTATUS status;
|
|
int depth;
|
|
const char *p, *next_p;
|
|
|
|
DEBUG(10, ("notify_trigger called action=0x%x, filter=0x%x, "
|
|
"path=%s\n", (unsigned)action, (unsigned)filter, path));
|
|
|
|
/* see if change notify is enabled at all */
|
|
if (notify == NULL) {
|
|
return;
|
|
}
|
|
|
|
again:
|
|
status = notify_load(notify, NULL);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return;
|
|
}
|
|
|
|
/* loop along the given path, working with each directory depth separately */
|
|
for (depth=0,p=path;
|
|
p && depth < notify->array->num_depths;
|
|
p=next_p,depth++) {
|
|
int p_len = p - path;
|
|
int min_i, max_i, i;
|
|
struct notify_depth *d = ¬ify->array->depth[depth];
|
|
next_p = strchr(p+1, '/');
|
|
|
|
/* see if there are any entries at this depth */
|
|
if (d->num_entries == 0) continue;
|
|
|
|
/* try to skip based on the maximum mask. If next_p is
|
|
NULL then we know it will be a 'this directory'
|
|
match, otherwise it must be a subdir match */
|
|
if (next_p != NULL) {
|
|
if (0 == (filter & d->max_mask_subdir)) {
|
|
continue;
|
|
}
|
|
} else {
|
|
if (0 == (filter & d->max_mask)) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* we know there is an entry here worth looking
|
|
for. Use a bisection search to find the first entry
|
|
with a matching path */
|
|
min_i = 0;
|
|
max_i = d->num_entries-1;
|
|
|
|
while (min_i < max_i) {
|
|
struct notify_entry *e;
|
|
int cmp;
|
|
i = (min_i+max_i)/2;
|
|
e = &d->entries[i];
|
|
cmp = strncmp(path, e->path, p_len);
|
|
if (cmp == 0) {
|
|
if (p_len == e->path_len) {
|
|
max_i = i;
|
|
} else {
|
|
max_i = i-1;
|
|
}
|
|
} else if (cmp < 0) {
|
|
max_i = i-1;
|
|
} else {
|
|
min_i = i+1;
|
|
}
|
|
}
|
|
|
|
if (min_i != max_i) {
|
|
/* none match */
|
|
continue;
|
|
}
|
|
|
|
/* we now know that the entries start at min_i */
|
|
for (i=min_i;i<d->num_entries;i++) {
|
|
struct notify_entry *e = &d->entries[i];
|
|
if (p_len != e->path_len ||
|
|
strncmp(path, e->path, p_len) != 0) break;
|
|
if (next_p != NULL) {
|
|
if (0 == (filter & e->subdir_filter)) {
|
|
continue;
|
|
}
|
|
} else {
|
|
if (0 == (filter & e->filter)) {
|
|
continue;
|
|
}
|
|
}
|
|
status = notify_send(notify, e, path + e->path_len + 1,
|
|
action);
|
|
|
|
if (NT_STATUS_EQUAL(
|
|
status, NT_STATUS_INVALID_HANDLE)) {
|
|
struct server_id server = e->server;
|
|
|
|
DEBUG(10, ("Deleting notify entries for "
|
|
"process %s because it's gone\n",
|
|
procid_str_static(&e->server)));
|
|
notify_remove_all(notify, &server);
|
|
goto again;
|
|
}
|
|
}
|
|
}
|
|
}
|